The Art
of Lossless
Data Compression
vol. 22g

Here are the results of tests performed in May 2001 to compare
lossless compression of True Color (24-bit) images by all known programs
developed for such purpose, including BMF, JPEG-LS and PNG software,
7-Zip, Pkzip, and archivers with special algorithms for 24-bit images.
See Archive Comparison Test by Jeff Gilchrist for more info: http://act.by.net
If anybody wants to start or continue such tests,
or can suggest some other sets of images, or other compression programs,
(not sources or algorithm descriptions, executable programs only)
or knows we have missed something important,
(some new fantastic technology, an algorithm or even a program capable
of lossless compression of up to 1000:1 and lossy compression of
up to 10000:1, we hear about it from time to time since PC-XTs)
please let us know immediately: artest@inbox.ru Thank you!

[[3]] Details

are no longer put to this main text
(872 lines reporting 17754 results on 538 files in 12 sets),
but can be found in FULL version with GRAPHICS.DAT and all *.BAT
at http://geocities.com/SiliconValley/Bay/1995/artest22.zip
or http://artest1.tripod.com/artest22.zip
1,2,3,4,9 image sets were taken from ftp://www.cipr.rpi.edu/pub/image/ and
/image2/ , converted from Sun Raster format to Windows Bitmap,
(this conversion changes image headers only, 32 bytes
are replaced by 54 bytes, but image data is not modified)
This site www.cipr.rpi.edu is described in comp.compression FAQ,
in 29 lines of "Subject: [55] Where can I find Lenna and other images?"
Eight images in the 5th set are from the famous Waterloo Color Set,
( losslessly compressed to 2,850,878 bytes,
it can be found at http://geocities.com/eri32 )
6,7,8th image sets are from ftp://download.intel.com/pressroom/images/
They were converted from TIFF format to Windows Bitmap.
10th and 11th sets were downloaded from ftp://ftp.kodak.com/www/images/
Some images were slightly renamed. See GRAPHICS.DAT inside artest22.zip
for more details. Some new images (from download.intel.com) were not added yet.

What's new:

3 new programs tested: ERI32 4.15fre, SBC 0.850b, PNGCrush 1.5.4.
Newer versions of SBC, ZZip and ERI32 are ready, they will be tested next time.
Results of BTPC, IMP and Ufa1 are in the full version only, see GRAPHICS.DAT.
Latest beta versions of DC, UFA, UHARC are available from authors by e-mail:
DC: EdgarBinder@t-online.de
UFA: support@7-zip.com
UHARC: Uwe.Herklotz@gmx.de

WARNINGS:

ZZip 0.36b can't losslessly decompress some images: kodak01 ... kodak17.bmp,
footbal* and susie* from 2nd set, moore2.bmp from 6th.
ESP, Rkive and some other programs are not tested any more,
their results and links can be found in previous versions:
ESP - artest3...artest12
Rkive - 3...12
UFA - 3...12
777 - 13...14
BOA - 7...14
UHARC - 5...10
SEA - 12...19
CompuShow 2000! - 3...11
The LATEST RELEASE, and all previous versions of these tests can be found
at http://geocities.com/SiliconValley/Bay/1995/ and http://artest1.tripod.com/
Send your suggestions, comments to artest@hotmail.ru
With best kind regards,
A.Ratushnyak,
RAO Inc.
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